In the free burning phase of a fire, temperatures can exceed what level in degrees Celsius?

• A. 300 degrees
• B. 500 degrees
• C. 700 degrees
• D. 900 degrees

Answer: (C)

In the free burning phase of a fire, temperatures can indeed exceed 700 degrees Celsius. This phase is characterized by a rapid combustion process where there is sufficient oxygen available, allowing the fire to grow in intensity and temperature. During this stage, materials ignite quickly and release significant heat, creating a environment that can sustain high temperatures.

The free burning phase occurs after the initial growth phase of a fire, where the fire transitions from smoldering to a full blaze. At this point, the reactions involved in combustion become more vigorous, leading to temperatures that can reach 900 degrees Celsius or even higher, depending on the materials burning and the conditions present. Therefore, understanding this thermodynamic aspect is crucial for firefighting and safety procedures in mining operations, as well as for identifying effective measures for controlling and extinguishing fires.